Runtz work good for the gas gauge (and electric temp and oil pressure if you have them). Others on this board say changing from 6v to 12v on the gas gauge requires No reduced voltage, but that once you do it you can't change back.
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12
'52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.
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